bugfix-9076_d

[*] fix wallet wrong path error
[*] change dynamic mamory allocation to static in dap_chain_net_init and dap_chain_net_srv_init
[*] add NULL protection to the dap_chain_net_srv_xchange_init
[*] legacy remove
[*] add datum_index clearing to s_callback_cs_blocks_purge
[+] add s_dap_chain_net_purge func
[+] add s_stake_net_clear func

requested review from @roman.khlopkov

assigned to @roman.khlopkov

mentioned in commit b6146525

merged